Think these recommendations are spot on and realistic. Should not be magically alterted of enemy and unrealistically restricted by them. If the player opts to build either alone, or while buddies cover while an enemy is near, that is their call. Also limiting build view so it does not show enemy, therefore it cannot be used as an advantage.

This might he helpful but then might not.

With the problem existing when repairing or digging go to ...

Settings > Controllers > Headtracking > Set Freelook control (NO)
Start making repair and obviously the view stays focused.
Now return to Freelook control and set to (YES)
View with Headtracking now stays remarkably focused (initially).
Stop repairing and run around with character
Return to repair and the TrackIR snap starts happening. Might be slight to begin with.

Stop repairing and move around more and the snap can become progressively worse.
Disabling Freelook control and re-enabling again seems to address it temporarily.

Snap severity seems to depend on angle of view. I can stand in same spot with repair prompt visible, hit F and view may snap 45 degrees to the left. Change my angle of view on the repair prompt by rotating player body, and it may then snap right 10 degrees, or down 10 degrees. Almost random.. but not.

Hope this info is of some use.

Extra video of how drastic the snap is as of 1.7.0.33. Happens when getting in vehicles / heli as well.

With the latest update, this issue seems to have increased. Getting vehicle, heli, repairing.. view snaps drastically over shoulder.

Yes it appears like those signs of fatigue are virtually non existent. I know running up a hill, once it reaches a certain slope, will slow you down but your stamina actually replenshes but usually when you maintained a certain speed like on flat land, slight incline or even down hill, your character would progressively start breathing harder.